How to cut a concrete floor for new plumbing

Written by lisa wampler
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A concrete slab, like a basement floor can cause serious dilemmas when it comes time to install a new line of plumbing. This is a common issue when installing a bathroom in a basement. You must connect a line from the existing main drain to the drainage system you want to use in the bathroom. Fortunately, when you install plumbing, you do it in a series of straight lines. This makes using a concrete walk-behind saw a natural tool for this task

Skill level:

Things you need

  • Chalk string
  • Walk-behind saw

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  1. 1

    Locate the starting point and the ending point of your first cut. Place the end of a chalk string at each point, hold the string tout and snap the chalk line against the floor. This gives you a straight, visible outline to follow.

  2. 2

    Measure over to the left of the line approximately 6-inches at each end of the line and snap another chalk line. Do the same by measuring over to the right approximately 6-inches and snap a third line. This gives you a 12-inch channel for laying pipe. If you need more, simply add inches to each side to widen the gap.

  3. 3

    Place the blade on the front of your walk-behind cutter over the chalk line on the right and position it so the apex of the blade rests right at the end of the line.

  4. 4

    Turn on the saw, lift the blade off the ground a few inches and engage the saw blade. The saw blade will start rotating quickly. This is why it is important to engage the saw with the blade off the ground. Otherwise, the saw might pull you forward.

  5. 5

    Lower the blade into the ground. Allow the blade to make the cut. The blade will go into the ground approximately two-inches. Slowly guide the saw down the straight line while it cuts. Stop when the apex of the blade reaches the end of the chalk line.

  6. 6

    Lift the saw blade out of the concrete and turn the blade off.

  7. 7

    Duplicate the cutting process on the line all the way to the left. With the second line cut, you can remove the concrete from the channel and dig your trench in the dirt for your plumbing.

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